Document Type

Article

Publication Date

1-1-2011

Publication Title

Astrophysical Journal Letters

Volume

726

Issue Number

1

DOI

10.1088/2041-8205/726/1/L9

Disciplines

Astrophysics and Astronomy

Abstract

We analyze our accurate kinematical data for the old clusters in the inner regions of M31. These velocities are based on high signal-to-noise Hectospec data. The data are well suited for analysis of M31's inner regions because we took particular care to correct for contamination by unresolved field stars from the disk and bulge in the fibers. The metal-poor clusters show kinematics that are compatible with a pressure-supported spheroid. The kinematics of metal-rich clusters, however, argue for a disk population. In particular the innermost region (inside 2 kpc) shows the kinematics of the x 2 family of bar periodic orbits, arguing for the existence of an inner Lindblad resonance in M31.

Comments

Copyright © 2011 Institute of Physics. The published version of the article can be found online at: http://dx.doi.org/10.1088/2041-8205/726/1/L9.

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